PETROPHYSICAL ANALYSIS OF SAWAN-01 WELL, CENTRAL INDUS BASIN, PAKISTAN

Abstract

The purpose of this study is to find the hydrocarbon potential of Sawan 01 well, Central Indus Basin, Pakistan. Sawan Gas field is situated in Khairpur district, Sindh Province. It is located in Thar Desert, with geographical coordinate of 26°55'34'' to 27°17'14'' N and 68°32'28'' to 69°18'40'' E. This tectonically complexed area lies in the extensional regime. Sawan-01 well is drilled from Siwaliks of Eocene age to the late cretaceous Lower Goru Formation. Different logs that are GR log, density log, resistivity logs, caliper and the neutron log is required for purpose of petrophysical interpretation. The potential reservoir lies in sands of lower Goru Formation. Based on Petrophysical analysis, two prospect zones have been marked in the Lower Goru Formation at the depths 3251 to 3260m and 3312 to 3319m. In these zones, the volume of shale is reported for zone 1 and 2 is 11.45% and 7.2%, average porosity is 13.5% and 16.3%, whereas effective porosity is 12% and 15.1%. The average water saturation (Sw) in these two zones are 26.9% and 30.3% whereas, total average saturation of hydrocarbon (Sh) explicitly are 73% and 69.6%, respectively. On the basis of calculated parameters, the Lower Goru Formation has the fair potential of having hydrocarbons.